SAN DIEGO -- Real-world issues are rare at Comic-Con where fantasy almost always trumps reality. But for the stars and director of "Ender's Game," comments made by author Orson Scott Card regarding gay marriage are leading to questions about the issue as they promote the science fiction film.

Card has expressed opposition to gay marriage in the past and that has led some to call for a boycott. There were no signs of protest Wednesday as young stars Asa Butterfield and Hailee Steinfeld and the film's director, Gavin Hood, began to promote the sci-fi adventure film. There was a full day of questions ahead, though, as "Ender's Game" took center stage Thursday.

"My view is I've been a member of the Courage Campaign for many years and I'm a little distressed by his point of view on gay marriage," Hood said.

"However, the book is not about that issue, so I hope people can still appreciate the book because I think he wrote a great book, and the themes and ideas in the book, I think, are universal and timeless and applicable, and I hope the book will still be appreciated as a great work of art, even though I don't agree with the author. I optioned the book, not an author, and I love what the author said in that book."